| 摘要: |
| 我国现行码头抗震设计规范采用的单水准抗震设计方法，不能反映不同地震烈度时的抗震性能.采用有限差分软件FLAC 3D，对重力式码头的地震响应和地基状况进行了分析计算，研究重力式码头在不同强度地震作用下地基的超孔隙水压力、超孔压比和码头位移，并用国际航运协会码头结构抗震设计指南所规定的性能设计准则进行了评判.计算表明，在强度较小地震作用下，所分析的重力式码头结构和地基的破坏程度较小，不影响结构的正常使用.在较强地震作用下，沉箱底部置换砂超孔压比增幅较小，置换砂并未液化；码头陆侧回填土层超孔压比增幅较大，回填土层在加速度峰值增加到0.2g后，在不同位置发生液化，沉箱水平及竖向位移在加速度峰值出现后急剧增大，最终导致重力式码头结构发生不同程度的破坏. |
| 关键词: 重力式码头 抗震 液化 超孔压比 位移 |
| DOI： |
| 分类号:TU43 |
| 基金项目:国家自然科学基金资助项目（51278081） |
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| Test analysis of conjugate depth and hydraulic jump length of roughened stilling basin |
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HAN Shi, GONG Jin-xin, ZHANG Yan-qing
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The State Key Laboratory of Coastal and Offshore Engineering， Dalian University of Technology
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| Abstract: |
| Calculation methods of conjugate depth and hydraulic jump length of the roughened stilling basin with uniform gravel bed are proposed in this study. According to the test data given by Hughes on the conjugate depth and hydraulic jump length of the roughened stilling basin with the gravel bed， hydraulic jump equation and the change law of hudraulic jump length with the upstream Froude number， upstream supercritical flow depth， downstream subcritical flow depth and roughness height are analized through the dimension concordant principle. The conjugate depth is increasing with the increasing in Froude number and decreasing with increasing in the roughness height. The hydraulic jump length is also the function of the upstream Froude number， upstream supercritical flow depth， downstream subcritical flow depth and roughness height. Meanwhile， energy dissipation ratio in the hydraulic jump region is increasing with increasing in the roughness height. Calculation formulas of the conjugate depth and the hydraulic jump length of the roughened stilling basin with uniform gravel bed, verified by the test results of FGCarollo, are put forward. |
| Key words: gravity wharf seismic design liquefaction excessive pore pressure ratio displacement |
